incorrect account number

Hi there, I gave our client the company's incorrect account number which was one digit short. The client made a deposit of R12000 in this wrong account number. The client that banks with Absa , Absa says that the payment was done successful via EFT and that this wrong account number does exists . Standard bank which the company I work for banks with them says that they can't assist in getting the funds reversed. My employer is now deducting R1500 per month from my salary holding me responsible for being negligence. When standard bank goes into this account all they say is sorry this amount is lost . your urgent response is required as I'm a single parent and desperately seeking your help .